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The calibration values are shown in two tabs, Gauge Pressure and Differential Pressure.
Calibration cannot take place unless a connection is present between the Schema Viewer PC and the valve. This can be accomplished with an I/R wand or, in this case, an Ethernet connection as indicated by the green box at the bottom of the dialog
The current values are displayed at the top of the dialog. Fluid pressure at sensor A and B are displayed in milliVolts, along with the calibrated pressure in pounds per square inch and the percentage of the
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sensor maximum pressure. The Smart Valve hardware has circuitry to generate a separate differential pressure reading; the value displayed is the output from this circuitry and may not be the arithmetic difference of the Pressure Sensor A and Pressure Sensor B reading.
Gauge Pressure Tab Calibration Values are set by applying a pressure to both pressure sensors simultaneously at, 0%, 50%, and 100%. The values of the pressure to be applied are shown to the right of the percent values. E.g. in Figure 18, 50% corresponds to an applied pressure.250psi. Calibration is performed by stepping through each applied pressure and pressing the Set button to record each calibration voltage value (in milliVolts). Once the values are set, they must be downloaded to the actuator by pressingSave to Hardware. The pressures to be applied at each step will automatically change based on the pressure sensors fitted to the actuator.
Differential Pressure Tab Calibration Values areset by applying the same pressure to both pressure sensors in all steps except one. The two values of pressure to be applied are shown at each step. E.g. in Figure 19, the same pressure can be seen in each step except for step one where 0 psi is to be applied to Sensor A and 15psi is to be applied to Sensor B. Calibration is performed by stepping through each applied pressure step and pressing the Set button to record each calibration voltage value (in milliVolts). Once the values are set, they must be downloaded to the actuator by pressingSave to Hardware. The applied pressures, and the number of calibration steps, will automatically change based on the pressure sensors fitted to the actuator.
Save to Hardware. Pressing this button will download the Calibration Values to the actuator. This action will overwrite any existing values stored in hardware.
NOTE: If the old values are to be saved they can be retrieved and then stored by first using the Upload from Hardware then Save to File options.
Load from Hardware will upload the current calibration values stored in the actuator and display them in corresponding Calibration Values tab. Once loaded the Calibrated Pressure value will display the correct calibrated pressure. The uploaded values can then be saved to file for later use.
Save to File. Pressing this button will save the values displayed in each Calibration Values tab to a file. The user will be prompted for a file name prior to saving.
Load from File. Calibration valuesstored via the Save to File option can be retrieved by pressing this button. The user will be prompted to select a file from a File Open dialog. The loaded data will be displayed in each Calibration Values tab and can be then downloaded to the hardware.